Lets double check to make sure your constraints do indeed match some machines. Try:
condor_status -const ' ( Arch == "X86_64" ) && ( OpSys == "LINUX" ) && ( ( CkptArch == "X86_64" ) || ( CkptArch is undefined ) ) && ( ( CkptOpSys == "LINUX" ) || ( CkptOpSys is undefined ) ) && ( Disk >= 10000 ) && ( ( Memory * 1024 ) >= 10000 )'
Hmm I do not get any output. Does it means none of the machine matches?